CVE-2026-11420
CriticalCVSS 9.8Exploitation Probability (EPSS)
Low risk50th percentile - higher than 50% of all known CVEs
Summary
Two path traversal vulnerabilities in the Network Installation Service (NIS) of Altium Enterprise Server allow an unauthenticated network attacker to write arbitrary files to writable locations and read package archive files. No authentication is required.
Risk Assessment
An attacker can achieve remote code execution in the context of the service account by overwriting application binaries or configuration files, and can disclose deployment package contents.
Recommendation
Update Altium Enterprise Server to the latest version that fixes the path traversal vulnerabilities. Restrict network access to the NIS service to trusted hosts only.
Original NVD description (English source)
Two path traversal vulnerabilities in the Network Installation Service (NIS) of Altium Enterprise Server allow an unauthenticated network attacker to write arbitrary files to any writable location on the server filesystem and to read package archive files from the server. No authentication, session, or credentials are required. Because content-controlled files can be written to web-accessible directories, or used to overwrite application binaries or configuration files, exploitation can be escalated to remote code execution in the context of the service account, and can disclose deployment package contents. Altium 365 cloud deployments are not affected, as the Network Installation Service is not part of the cloud offering.